Use fixed version of prebuilt Installer-Framework for maintenance tool

The maintenance tool version in online repositories should be "fixed"
i.e. not use the latest build. Prebuilt maintenance tool put into
separate location for online repository builds.

Change-Id: I27ea43d0a3127ef3c41d904457a2b3b7455041ca
Reviewed-by: Matti Paaso <matti.paaso@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>